It is disappointing, both the integrator down as of today, but also their plans to, it seems, totally abandon the platform at some point, possibly not that much in future (I don't know of precise date, but some are talking as early as this quarter). I like many things about Dan and it will be a loss to the domain community. I still have faint hope that they will reverse and keep Dan. Of course I also have faint hope that the Maple Leafs will win the Stanley Cup some year.
For closing sales, as well as traditional choices like Escrow.com and Sedo, we now have Atom Pay. I have used it once already, and the process was very smooth, and to me the 4.5% fee is very reasonable, considering that as well as payment processing they handle the name transfer and 24/7 support to the buyer during the process. Of course Efty Pay is also an option, and see already someone has shared some details on that.
I think right now Efty Pay is 5% if you are bringing your lead say from your own marketplace, or selling directly from your lander if you have an Efty account, and 12.5% if it sells via someone finding the name on the Efty Marketplace. This page has a good summary: What is the commission fee you charge for domain sales? - Efty - Knowledge Base
They do have a lower fee but I think only for investors who signed on prior to the launch. Not sure the details. And I don't think perpetually low.
A table of closing options and costs would be helpful. I will see, but right now some things unrelated to domain names are taking a lot of my attention and time.